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drm: introduce drm_dev_{get/put} functions

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Reference counting functions in the kernel typically use get/put suffixes. For
maintaining coding style consistency, introduce drm_dev_{get/put} functions. All
callers of drm_dev_ref() API have been converted in this patch and hence it has
been dropped while the drm_dev_unref() API with non-trivial number of users
remains for compatibility.

The semantic patch scripts/coccinelle/api/drm-get-put.cocci has been updated
with the new helper for conversion of drm_dev_unref() to drm_dev_put()

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/6babda56134035a98220d5d37a4fd4048df214ce.1506413698.git.aishpant@gmail.com
This commit is contained in:
Aishwarya Pant
2017-09-26 13:58:49 +05:30
committed by Daniel Vetter
parent f2a44dd023
commit 9a96f55034
4 changed files with 41 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/gpu/drm/drm_drv.c
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@@ -286,13 +286,13 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
spin_lock_irqsave(&drm_minor_lock, flags);
minor = idr_find(&drm_minors_idr, minor_id);
if (minor)
drm_dev_ref(minor->dev);
drm_dev_get(minor->dev);
spin_unlock_irqrestore(&drm_minor_lock, flags);
if (!minor) {
return ERR_PTR(-ENODEV);
} else if (drm_dev_is_unplugged(minor->dev)) {
drm_dev_unref(minor->dev);
drm_dev_put(minor->dev);
return ERR_PTR(-ENODEV);
}
@@ -301,7 +301,7 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
void drm_minor_release(struct drm_minor *minor)
{
drm_dev_unref(minor->dev);
drm_dev_put(minor->dev);
}
/**
@@ -326,11 +326,11 @@ void drm_minor_release(struct drm_minor *minor)
* When cleaning up a device instance everything needs to be done in reverse:
* First unpublish the device instance with drm_dev_unregister(). Then clean up
* any other resources allocated at device initialization and drop the driver's
* reference to &drm_device using drm_dev_unref().
* reference to &drm_device using drm_dev_put().
*
* Note that the lifetime rules for &drm_device instance has still a lot of
* historical baggage. Hence use the reference counting provided by
* drm_dev_ref() and drm_dev_unref() only carefully.
* drm_dev_get() and drm_dev_put() only carefully.
*
* It is recommended that drivers embed &struct drm_device into their own device
* structure, which is supported through drm_dev_init().
@@ -345,7 +345,7 @@ void drm_minor_release(struct drm_minor *minor)
* Cleans up all DRM device, calling drm_lastclose().
*
* Note: Use of this function is deprecated. It will eventually go away
* completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
* completely. Please use drm_dev_unregister() and drm_dev_put() explicitly
* instead to make sure that the device isn't userspace accessible any more
* while teardown is in progress, ensuring that userspace can't access an
* inconsistent state.
@@ -360,7 +360,7 @@ void drm_put_dev(struct drm_device *dev)
}
drm_dev_unregister(dev);
drm_dev_unref(dev);
drm_dev_put(dev);
}
EXPORT_SYMBOL(drm_put_dev);
@@ -386,7 +386,7 @@ void drm_dev_unplug(struct drm_device *dev)
mutex_lock(&drm_global_mutex);
drm_device_set_unplugged(dev);
if (dev->open_count == 0)
drm_dev_unref(dev);
drm_dev_put(dev);
mutex_unlock(&drm_global_mutex);
}
EXPORT_SYMBOL(drm_dev_unplug);
@@ -475,8 +475,8 @@ static void drm_fs_inode_free(struct inode *inode)
* initialization sequence to make sure userspace can't access an inconsistent
* state.
*
* The initial ref-count of the object is 1. Use drm_dev_ref() and
* drm_dev_unref() to take and drop further ref-counts.
* The initial ref-count of the object is 1. Use drm_dev_get() and
* drm_dev_put() to take and drop further ref-counts.
*
* Note that for purely virtual devices @parent can be NULL.
*
@@ -626,8 +626,8 @@ EXPORT_SYMBOL(drm_dev_fini);
* initialization sequence to make sure userspace can't access an inconsistent
* state.
*
* The initial ref-count of the object is 1. Use drm_dev_ref() and
* drm_dev_unref() to take and drop further ref-counts.
* The initial ref-count of the object is 1. Use drm_dev_get() and
* drm_dev_put() to take and drop further ref-counts.
*
* Note that for purely virtual devices @parent can be NULL.
*
@@ -670,36 +670,49 @@ static void drm_dev_release(struct kref *ref)
}
/**
* drm_dev_ref - Take reference of a DRM device
* drm_dev_get - Take reference of a DRM device
* @dev: device to take reference of or NULL
*
* This increases the ref-count of @dev by one. You *must* already own a
* reference when calling this. Use drm_dev_unref() to drop this reference
* reference when calling this. Use drm_dev_put() to drop this reference
* again.
*
* This function never fails. However, this function does not provide *any*
* guarantee whether the device is alive or running. It only provides a
* reference to the object and the memory associated with it.
*/
void drm_dev_ref(struct drm_device *dev)
void drm_dev_get(struct drm_device *dev)
{
if (dev)
kref_get(&dev->ref);
}
EXPORT_SYMBOL(drm_dev_ref);
EXPORT_SYMBOL(drm_dev_get);
/**
* drm_dev_unref - Drop reference of a DRM device
* drm_dev_put - Drop reference of a DRM device
* @dev: device to drop reference of or NULL
*
* This decreases the ref-count of @dev by one. The device is destroyed if the
* ref-count drops to zero.
*/
void drm_dev_unref(struct drm_device *dev)
void drm_dev_put(struct drm_device *dev)
{
if (dev)
kref_put(&dev->ref, drm_dev_release);
}
EXPORT_SYMBOL(drm_dev_put);
/**
* drm_dev_unref - Drop reference of a DRM device
* @dev: device to drop reference of or NULL
*
* This is a compatibility alias for drm_dev_put() and should not be used by new
* code.
*/
void drm_dev_unref(struct drm_device *dev)
{
drm_dev_put(dev);
}
EXPORT_SYMBOL(drm_dev_unref);
static int create_compat_control_link(struct drm_device *dev)
@@ -839,7 +852,7 @@ EXPORT_SYMBOL(drm_dev_register);
*
* Unregister the DRM device from the system. This does the reverse of
* drm_dev_register() but does not deallocate the device. The caller must call
* drm_dev_unref() to drop their final reference.
* drm_dev_put() to drop their final reference.
*
* A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
* which can be called while there are still open users of @dev.